docs: add nlopt system dependency prerequisite

[alceops]

Summary

• document libnlopt-dev as an Ubuntu prerequisite when nlopt has to build from source
• add the same prerequisite to the Quick Start pip install path and Build from Source apt package list

Fixes #452.

Verification

• git diff --check
• confirmed both updated getting-started docs mention libnlopt-dev

Note: pre-commit is not installed in my local environment, so I could not run the repository pre-commit hook set.

Summary by CodeRabbit

• Documentation
  • Updated build-from-source documentation to explicitly require NLopt development headers when building Python bindings with NLopt support
  • Enhanced quick-start guide with Ubuntu system dependency installation step for the required libnlopt-dev package
  • Aligned prerequisite requirements across documentation for consistent setup instructions

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between a939dd1 and 970a937.

📒 Files selected for processing (2)

• docs/source/getting_started/build_from_source/index.rst
• docs/source/getting_started/quick_start.rst

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📝 Walkthrough

Walkthrough

Documentation updates to address a missing system dependency prerequisite. The guides for Quick Start and Build from Source now explicitly document the requirement for libnlopt-dev development headers on Ubuntu systems, since the nlopt Python package may fall back to building from source (particularly on aarch64 platforms where pre-built wheels are unavailable). The updates include adding the system package name to the prerequisites list and inserting an installation step with the appropriate apt-get command.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'docs: add nlopt system dependency prerequisite' accurately describes the main change of documenting the libnlopt-dev system dependency in the Quick Start and Build from Source guides.
Linked Issues check	✅ Passed	The pull request successfully addresses issue #452 by adding libnlopt-dev documentation to both the Quick Start and Build from Source guides, resolving the undocumented system dependency that caused nlopt wheel build failures.
Out of Scope Changes check	✅ Passed	All changes in the pull request are directly scoped to documenting the libnlopt-dev system dependency in the Quick Start and Build from Source guides as required by issue #452.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

📝 Docs preview is not auto-deployed for fork PRs.

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[jiwenc-nv]

that's not the real fix. the original issue #452 is something specific to a special hardware.